Tube-deflating valve



June 10, 1930. KRUSIELL 1,762,823

' TUBE DEFLATING VALVE Filed May 16. 1927 INVENTOR.

QZf M BY TORNEY.

Patented June 10, 1930 RUBBER MASSACHUSETTS i wee-teatime I: 2'

eral types of deflating devices have heret'o-' fore'been'proposed some of'them' operating toeonnectihe' valve stem of the tubetoai source of suction hen the" 'stem is: inserted inQth'e device and to shut ofi the supply of suction automaticallywvhenthe tube 'va lve' is removed. My invention; relates particulari 1y to improvements in the latter type of deflatingdevice. Among the improvements which "I'ha ve sought to accomplish by my deviceisthe prevention of clogging due to accumulation ofdust with-in thefdefl'ating device, the provision of- -a si'ngle, apparatus which will take all types of.-valvestems, the provision of a simple, rugged'and at the same time fine adjustment a nd fthe;construction of the valve in suchfa manner thatit may be taken a'partifor 'cleaningwithout disturbing v I I I; which mayhave collected onthe-top of the the adjustment;

Referring to the drawings: w I

Fig; 1 is a side elevation of myimproved deflating device with a tube in place; :Fig. 2 is a frontelevation thereof;

' Fig. 3 is a view oira' largerflscale takenin median sect1on-,"t'he partsgbeing shown mth position they occupy during the operation ot W e ,l 3 -wh1ch when the valve 1s closed he wlthln the 1 deflating atube;

Fig. 4: 1s a view'similarto Fig. 3 showing the parts in the positionsthey occupy'after the deflating device has automatically shut off upon removal of the tube valve.

The deflating device is mounted upon a suction T joined by nipples 11. and a 45 L 12 to a T 13. This latterT is a portion of a threads 18 at each end. 1 At one end the barrel 1 is held in the suction "T by a nut 19 bearing I upon a spacing collar 20 which compresses a packing 21 located between the spacing collar and a shoulder onthe barrel. 2 At the other end of the barrel is threaded a cap 22 bearing upon the packing 23. By this means the cloggingof the valve. y V v In-the stem 28 .are formed holes 32 which with the piston iniitheoperative position of Fig.3 connect the interior oif'the stem with suction main 14 shoWn as held to a wall orv other support" 15 by bracketslfi; Intothe f suction T 10 is fitted-a barrel 17. having,

I The barrel is tans GQKRIISIYELL, .or j cnrcornnFALLsj]maseacnnsiirrs,.assienoauTo E-315 15 g M ANY Q orzicorEn FALLS, MASSAQHUSETTS. A,CQBPORArIOn or barrel is rigidly held in the suction T with an formed with a central bore 7 enlarged at one end to form a cylinder24. In.

. thi scylinder runs a piston 25 preferably cut awayras at. 26 in order to. reduce itsfrictiong I Into the main portion of the central bore is fitted a bushing2'7, thebushing and the barrel wall being'c-ut away sodasto separatefthe main portion of the bore from the cylinder 245by'a shoulder 26' Within the bushing 27 runs the hollow stem28 of the piston 25, this hollow stem having abeveled valve receiving I seat 29 at its end." f

A groove "30 is formed around the'barreli at the'point of separation. between the cylinder and the main portionof the bore,*and i 7 holes .31 connect this groove with the-inte 'rior' of the cylinder 24: as perhaps best shown .Fig 3. These holes are preferably posi-" t neds0ast0 be'dividedby-the'shoulder'26 i d the topof the piston 25 when the latter 1811115116 raised position of Fig. 41.. Any dust piston will therefore be carried oii' into the suction main and 'willnotcollect soas to cause the chamber forrned by thecylinder124 but;

bushing 27 and are thereby cut off from the:

source of suction. Within the hollow stem" valve in-orde'rto' provide-a suction: passage around it and having atiits upper end a tip 34- 'flatt'ened eat-it s sidesas indicated at 35. 1 1 The tip f extends within the tube valve" stem 4C5 as indicated in Fig; 3} -.and'depr esses the jvalvepliinger therein 'so as-to open-the con-' motion; between the interiorfioffthe tube and;

the space within the stem 28 The :fiat sides 35 tom an. air passage-inside the end-of the valve stem 45. f The other end of the deflat-I ing. ineais rormedawith ahead 36 fitting loosely within an enlargement 871 within the piston 25" and is held in place by a .tzhper screwed plug- 38. "The .fltting of the -de ing pin in the piston is kept loose so that it may accommodate itself to slight variations in the dimensions of the tube valves presented to it and will not bend or'injure the parts ofthese valves as has sometimes been the,

casein former devices.

The cap'22 is formed with a hole 39 having a beveled seat 40 receiving the tapered end 41 of a needle valve screw 42. This screw held in. adjusted position by a lock nut 43' and V servesto regulate the passage of air into the hole 39 from a Vent 44 leading into the atmosphere. Avery fine adjustment can be made by this means and yet the cap. 22 can, be removed to afford access to the piston 25 without in any way disturbing the adjustment,

In operation'a tube valve 45 is inserted in the bushing 27 as shown in ,Fig. 3, being pressed down upon the deflating pin so that the tip of the latter depresses the valve plunger. The tapered shoulder 47 upon the valve stem fits upon the beveled seat 29 to give by moving them within the bushing and givan air tight'joint. Vfith the parts in the condition of Fig. 3 deflation is continued to the desired extent. The operator then removes the tubeyvalve from the bushing 27. and the piston25 thereupon rises closing the holes 32 ing an additional seal by the contact of the upperend of the piston'with the lower endof the bushing. The reason for the rising of the piston is the difference in the pressure on its upper surface due to the suction and the substantial atmospheric pressure at its lower end. It is to control this automatic closing ofithe valve that the needle valve 42 isproj]. vided. During the normal operation of the deflating device it is necessary that the piston 45 gets high enough to cause the'latter to rise.

V r remain down. If the connection to the at mosphere left by the valve 42 is too large the pressure on the lower end of the piston will be sufficient to cause the valve to rise. The needle valve is therefore set so as to compen sate for the normal leakage past the piston 25' so that-the pressure below the piston never When the tube is removed from the deflating :d evice, however, the passage of airthrough the vent 44 permits the piston to seek a new position of'equilibrium and the latter then rises to the position shown in Fig. 4.

Having thus described my invention, I

. 1. A tire tube deflating device comprising a barrel having a central bore with an enlargement at one end separated from the main part of the bore by a shoulder, a piston having a hollow'stem sliding in the bore and a body portion sliding in the enlargement thereof,

the piston beinglimited in its motion in one direction bythe shoulder, a passage in the barrel permitting air tobe exhausted from the chamber between the piston stem and the enlargement in the bore, and opening into'the barrel so as to be divided by the shoulder, a

hole in the hollow stem communicating in one position of the piston with the chamber and cut ofl" from such communication by motion of the stem into the bore, and a deflatingpin loosely and movably mounted in the stem;

2. A tire. tube deflating device comprising a barrel having a central bore with an enlargement at one end separated from the main part of the bore by a shoulder, a piston hav- .ing a hollow stem slidingin the bore and a body portion sliding in the enlargement thereof, the piston beinglimited in its motion in one direction by the'shoulder, a passage in the barrel permittingair to be exhausted from the chamber between the piston stem and the enlargement in the bore and opening into the barrel so as to be divided by the shoulder, and a hole in the hollow stem communicating in one position of the piston with the chamber and cut ofl' from such communication by motion of the stem into the bore.

7 3. A .tire tube deflating device comprising a barrel having a central bore with an en- 2 largement at one end, a piston having a hollow King a barrel. having a suction chamber into which a tube valve maybe inserted, a shut off valve adapted to shut off the chamber from a suction source, said'valve being exposed on one side to the reduced pressure of said chamber, a removable capseparating the other side of the valve from the atmosphere, and a vented needle valve attached to' and removable with the cap whereby the access of air. from the atmosphere to the valve may be regulated. 1 i r LARS G. KRUSELL. 

